"""Async gunicorn worker for aiohttp.web"""

import asyncio
import inspect
import os
import re
import signal
import sys
from types import FrameType
from typing import Any, Optional

from gunicorn.config import AccessLogFormat as GunicornAccessLogFormat
from gunicorn.workers import base

from aiohttp import web

from .helpers import set_result
from .web_app import Application
from .web_log import AccessLogger

try:
    import ssl

    SSLContext = ssl.SSLContext
except ImportError:  # pragma: no cover
    ssl = None  # type: ignore[assignment]
    SSLContext = object  # type: ignore[misc,assignment]


__all__ = ("GunicornWebWorker", "GunicornUVLoopWebWorker")


class GunicornWebWorker(base.Worker):  # type: ignore[misc,no-any-unimported]
    DEFAULT_AIOHTTP_LOG_FORMAT = AccessLogger.LOG_FORMAT
    DEFAULT_GUNICORN_LOG_FORMAT = GunicornAccessLogFormat.default

    def __init__(self, *args: Any, **kw: Any) -> None:
        super().__init__(*args, **kw)

        self._task: asyncio.Task[None] | None = None
        self.exit_code = 0
        self._notify_waiter: asyncio.Future[bool] | None = None

    def init_process(self) -> None:
        # create new event_loop after fork
        self.loop = asyncio.new_event_loop()
        asyncio.set_event_loop(self.loop)

        super().init_process()

    def run(self) -> None:
        self._task = self.loop.create_task(self._run())

        try:  # ignore all finalization problems
            self.loop.run_until_complete(self._task)
        except Exception:
            self.log.exception("Exception in gunicorn worker")
        self.loop.run_until_complete(self.loop.shutdown_asyncgens())
        self.loop.close()

        sys.exit(self.exit_code)

    async def _run(self) -> None:
        runner = None
        if isinstance(self.wsgi, Application):
            app = self.wsgi
        elif inspect.iscoroutinefunction(self.wsgi) or (
            sys.version_info < (3, 14) and asyncio.iscoroutinefunction(self.wsgi)
        ):
            wsgi = await self.wsgi()
            if isinstance(wsgi, web.AppRunner):
                runner = wsgi
                app = runner.app
            else:
                app = wsgi
        else:
            raise RuntimeError(
                "wsgi app should be either Application or "
                f"async function returning Application, got {self.wsgi}"
            )

        if runner is None:
            access_log = self.log.access_log if self.cfg.accesslog else None
            runner = web.AppRunner(
                app,
                logger=self.log,
                keepalive_timeout=self.cfg.keepalive,
                access_log=access_log,
                access_log_format=self._get_valid_log_format(
                    self.cfg.access_log_format
                ),
                shutdown_timeout=self.cfg.graceful_timeout / 100 * 95,
            )
        await runner.setup()

        ctx = self._create_ssl_context(self.cfg) if self.cfg.is_ssl else None

        assert runner is not None
        server = runner.server
        assert server is not None
        for sock in self.sockets:
            site = web.SockSite(
                runner,
                sock,
                ssl_context=ctx,
            )
            await site.start()

        # If our parent changed then we shut down.
        pid = os.getpid()
        try:
            while self.alive:  # type: ignore[has-type]
                self.notify()

                cnt = server.requests_count
                if self.max_requests and cnt > self.max_requests:
                    self.alive = False
                    self.log.info("Max requests, shutting down: %s", self)

                elif pid == os.getpid() and self.ppid != os.getppid():
                    self.alive = False
                    self.log.info("Parent changed, shutting down: %s", self)
                else:
                    await self._wait_next_notify()
        except BaseException:
            pass

        await runner.cleanup()

    def _wait_next_notify(self) -> "asyncio.Future[bool]":
        self._notify_waiter_done()

        loop = self.loop
        assert loop is not None
        self._notify_waiter = waiter = loop.create_future()
        self.loop.call_later(1.0, self._notify_waiter_done, waiter)

        return waiter

    def _notify_waiter_done(
        self, waiter: Optional["asyncio.Future[bool]"] = None
    ) -> None:
        if waiter is None:
            waiter = self._notify_waiter
        if waiter is not None:
            set_result(waiter, True)

        if waiter is self._notify_waiter:
            self._notify_waiter = None

    def init_signals(self) -> None:
        # Set up signals through the event loop API.

        self.loop.add_signal_handler(
            signal.SIGQUIT, self.handle_quit, signal.SIGQUIT, None
        )

        self.loop.add_signal_handler(
            signal.SIGTERM, self.handle_exit, signal.SIGTERM, None
        )

        self.loop.add_signal_handler(
            signal.SIGINT, self.handle_quit, signal.SIGINT, None
        )

        self.loop.add_signal_handler(
            signal.SIGWINCH, self.handle_winch, signal.SIGWINCH, None
        )

        self.loop.add_signal_handler(
            signal.SIGUSR1, self.handle_usr1, signal.SIGUSR1, None
        )

        self.loop.add_signal_handler(
            signal.SIGABRT, self.handle_abort, signal.SIGABRT, None
        )

        # Don't let SIGTERM and SIGUSR1 disturb active requests
        # by interrupting system calls
        signal.siginterrupt(signal.SIGTERM, False)
        signal.siginterrupt(signal.SIGUSR1, False)
        # Reset signals so Gunicorn doesn't swallow subprocess return codes
        # See: https://github.com/aio-libs/aiohttp/issues/6130

    def handle_quit(self, sig: int, frame: FrameType | None) -> None:
        self.alive = False

        # worker_int callback
        self.cfg.worker_int(self)

        # wakeup closing process
        self._notify_waiter_done()

    def handle_abort(self, sig: int, frame: FrameType | None) -> None:
        self.alive = False
        self.exit_code = 1
        self.cfg.worker_abort(self)
        sys.exit(1)

    @staticmethod
    def _create_ssl_context(cfg: Any) -> "SSLContext":
        """Creates SSLContext instance for usage in asyncio.create_server.

        See ssl.SSLSocket.__init__ for more details.
        """
        if ssl is None:  # pragma: no cover
            raise RuntimeError("SSL is not supported.")

        ctx = ssl.SSLContext(cfg.ssl_version)
        ctx.load_cert_chain(cfg.certfile, cfg.keyfile)
        ctx.verify_mode = cfg.cert_reqs
        if cfg.ca_certs:
            ctx.load_verify_locations(cfg.ca_certs)
        if cfg.ciphers:
            ctx.set_ciphers(cfg.ciphers)
        return ctx

    def _get_valid_log_format(self, source_format: str) -> str:
        if source_format == self.DEFAULT_GUNICORN_LOG_FORMAT:
            return self.DEFAULT_AIOHTTP_LOG_FORMAT
        elif re.search(r"%\([^\)]+\)", source_format):
            raise ValueError(
                "Gunicorn's style options in form of `%(name)s` are not "
                "supported for the log formatting. Please use aiohttp's "
                "format specification to configure access log formatting: "
                "http://docs.aiohttp.org/en/stable/logging.html"
                "#format-specification"
            )
        else:
            return source_format


class GunicornUVLoopWebWorker(GunicornWebWorker):
    def init_process(self) -> None:
        import uvloop

        # Setup uvloop policy, so that every
        # asyncio.get_event_loop() will create an instance
        # of uvloop event loop.
        asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())

        super().init_process()
